I immediately thought about the first (?) releases Apple did for Windows: iTunes and Safari. Both were really bad but I have never seen software as buggy as that one new release of Safari that would crash if you clicked on any button.

It's basically a matter of how many good releases you do against the bad ones. Google is in bad shape right now but that changes quickly with a good release in the near future. (I'd say the new Gmail theme is a good release.)